Amaterasu vs Amaterasu Omikami

Amaterasu and Amaterasu Omikami both are nouns.

Word	Noun	Adjective	Verb	Adverb
Amaterasu	Yes	No	No	No
Amaterasu Omikami	Yes	No	No	No

As nouns, Amaterasu and Amaterasu Omikami are synonyms defined as:

Amaterasu and Amaterasu Omikami: central deity of Shinto; goddess personifying the sun and ancestress of the rulers of Japan

Amaterasu (noun)	Amaterasu Omikami (noun)
central deity of Shinto; goddess personifying the sun and ancestress of the rulers of Japan	central deity of Shinto; goddess personifying the sun and ancestress of the rulers of Japan